ProShares Ultra S&P500 (SSO) Short Interest Ratio & Short Volume

The short interest ratio, also known as the "days to cover ratio", is calculated by dividing the number of shares of a stock sold short divided by its average trading volume. A short interest ratio ranging between 1 and 4 generally indicates strong positive sentiment about a stock and a lack of short sellers. A short interest ratio of 10 or greater indicates strong pessimism about a stock. SSO shares currently have a short interest ratio of 0.4. Learn More on ProShares Ultra S&P500's short interest ratio.

Companies that have a short interest as a percentage of float below 10% indicates positive investor sentiment and few short sellers. Stocks with a short interest percentage above 10% is considered high, suggesting some investors are pessimistic about the stock. Companies with a short interest percentage of 20% or more indicates widespread negative sentiment. 1.60% of ProShares Ultra S&P500's floating shares are currently sold short.

ProShares Ultra S&P500 saw a drop in short interest during the month of April. As of April 30th, there was short interest totaling 1,846,516 shares, a drop of 34.9% from the previous total of 2,838,549 shares. Changes in short volume can be used to identify positive and negative investor sentiment. Investors that short sell a stock are betting that its price will decline in the future. An increase in short sale volume suggests bearish (negative) sentiment among investors. A decrease on short sale volume suggests bullish (positive) sentiment.

1.60% of ProShares Ultra S&P500's shares are currently sold short. Here is how the short interest of companies compare to ProShares Ultra S&P500: Vanguard Russell 1000 ETF (2.11%), First Trust Capital Strength ETF (0.07%), iShares Global 100 ETF (0.33%), Fidelity Enhanced Large Cap Core ETF (0.19%), Invesco S&P 500 Revenue ETF (0.32%), JPMorgan Global Select Equity ETF (0.06%), Invesco S&P 500 Low Volatility ETF (2.93%), Invesco RAFI US 1000 ETF (0.01%), VictoryShares Free Cash Flow ETF (0.14%), Schwab Fundamental Emerging Markets Equity ETF (1.40%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($86.09 billion), Invesco QQQ ($39.89 billion), iShares Russell 2000 ETF ($26.13 billion), Western Digital Corporation ($12.66 billion), Salesforce Inc. ($12.29 billion), Sandisk Corporation ($11.87 billion), SPDR S&P Biotech ETF ($9.82 billion), Lumentum Holdings Inc. ($8.51 billion), iShares 20+ Year Treasury Bond ETF ($7.76 billion), and Bloom Energy Corporation ($7.40 billion). View all of the most shorted stocks.

Short selling SSO is an investing strategy that aims to generate trading profit from ProShares Ultra S&P500 as its price is falling. To short a stock, an investor borrows shares, sells them and buys the shares back on the public market later to return it to the lender. Short sellers are betting that a stock will decline in price. If the stock does drop after selling, the short seller buys it back at a lower price and returns it to the lender. The difference between the sell price and the buy price is the trader's profit.

A short squeeze for ProShares Ultra S&P500 occurs when it has a large amount of short interest and its stock appreciates in price. This forces short sellers to cover their short interest positions by buying actual shares of SSO, which in turn drives the price of the stock up even further.

Short interest is typically published by a stock exchange once per month. However, NASDAQ publishes a report for U.S. stocks, including SSO, twice per month. The most recent reporting period available is April, 30 2026.